local URL_ERROR = "http://gitea.fse-media.group/Henry_Du/FSE-Ticket.sys/raw/branch/main/error.dfpwm"
local URL_PASS = "http://gitea.fse-media.group/Henry_Du/FSE-Ticket.sys/raw/branch/main/pass.dfpwm"
local URL_GATE = "http://gitea.fse-media.group/Henry_Du/FSE-Ticket.sys/raw/branch/main/gate.lua"
local URL_UPDATE_GATE = "http://gitea.fse-media.group/Henry_Du/FSE-Ticket.sys/raw/branch/main/update_gate.lua"

local CONFIG_PATH = "gate_config.json"

local function trim(s)
  return (tostring(s or ""):gsub("^%s+", ""):gsub("%s+$", ""))
end

local function splitCsv(s)
  local out = {}
  s = trim(s)
  if #s == 0 then return out end
  for part in s:gmatch("[^,/%s]+") do
    local v = trim(part)
    if #v > 0 then table.insert(out, v) end
  end
  return out
end


local function writeFile(path, content, binary)
  local mode = binary and "wb" or "w"
  local f = fs.open(path, mode)
  if not f then return false end
  f.write(content)
  f.close()
  return true
end

local function prompt(label)
  term.write(label)
  return trim(read() or "")
end

local function httpGet(url)
  if not http then return false, "HTTP API disabled" end
  local okReq, err = pcall(function()
    http.request({ url = url, method = "GET" })
  end)
  if not okReq then return false, tostring(err) end

  while true do
    local ev, p1, p2, p3 = os.pullEvent()
    if ev == "http_success" and p1 == url then
      local res = p2
      if type(res) == "table" and type(res.readAll) == "function" then
        local data = res.readAll()
        res.close()
        return true, data
      end
      return false, "invalid http response"
    end
    if ev == "http_failure" and p1 == url then
      local err = p2
      local res = p3
      if type(p2) == "table" and type(p2.readAll) == "function" then
        res = p2
        err = p3
      end
      if type(res) == "table" and type(res.readAll) == "function" then
        local data = res.readAll()
        res.close()
        return false, data
      end
      return false, tostring(err or "http_failure")
    end
  end
end

local function download(url, path, binary)
  print("Downloading: " .. path)
  local ok, data = httpGet(url)
  if not ok then
    print("Download failed: " .. tostring(data or ""))
    return false
  end
  if not writeFile(path, data, binary) then
    print("Write failed: " .. path)
    return false
  end
  return true
end

term.clear()
term.setCursorPos(1, 1)
print("Ticket Gate Installer")
print("")

local stationCode = trim(prompt("Station code: "))
if #stationCode == 0 then
  print("No station code provided.")
  return
end

local modeRaw = prompt("Gate mode (entry/exit): ")
local mode = (trim(modeRaw):lower() == "exit") and "exit" or "entry"
local cfg = { mode = mode, station_codes = { stationCode }, station_code = stationCode }
local okCfg, cfgJson = pcall(textutils.serializeJSON, cfg)
if not okCfg then
  print("Config serialize failed.")
  return
end
if not writeFile(CONFIG_PATH, cfgJson, false) then
  print("Failed to write config.")
  return
end

if not download(URL_PASS, "pass.dfpwm", true) then return end
if not download(URL_ERROR, "error.dfpwm", true) then return end

local okGate, gateCode = httpGet(URL_GATE)
if not okGate then
  print("Download failed: startup")
  return
end

writeFile("startup.lua", gateCode, false)
writeFile("startup", gateCode, false)
if not download(URL_UPDATE_GATE, "update_gate.lua", false) then return end

print("")
print("Done.")
print("This gate now supports tickets and IC cards.")
print("Reboot the computer to start the gate.")